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Efficient use of grassland nitrogen

Eriksen, J. (2004) Efficient use of grassland nitrogen. DARCOFenews (1).

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Online at: http://www.darcof.dk/enews/april04/grassland.html

Summary

In nitrate sensitive areas with agricultural production the recommended upper limit of nitrate in percolation water is 50 mg per litre. Organic farming has a lower nitrate leaching potential compared to conventional farming, but may occasionally exceed this limit, especially in the case of dairy crop rotations. In such rotations a considerable build-up of N takes place in grazed grassland. Therefore, organic dairy farming may only present an opportunity to reduce nitrate leaching if this grassland N is efficiently utilised. Losses may occur during grazing, and ploughing of grassland is followed by a large increase in the mineralization of N that often exceeds the need of the subsequent arable crop.
An experimental site at Research Centre Foulum has since 1997 been dedicated to studies on the utilization of grassland nitrogen in organic dairy systems. Different aspects have been studied and new investigations are in progress. Some of the main themes are described here in relation mainly to the effects observed on residual fertilizer effects and leaching losses.


EPrint Type:Journal paper
Subjects: Soil > Nutrient turnover
Research affiliation: Denmark > DARCOF II (2000-2005) > I. 4 (NIMAB) Enhanced bread wheat production
Denmark > DARCOF II (2000-2005) > I.15 (NIT_GRASS) Nitrate leaching from dairy farming
Deposited By: Eriksen, Senior scientist Jørgen
ID Code:3673
Deposited On:01 Oct 2004
Last Modified:12 Apr 2010 07:30
Document Language:English
Status:Published
Refereed:Not peer-reviewed
Additional Publishing Information:Newsletter from Danish Research Centre for Organic Farming

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